All five nucleobases that make up DNA and RNA have now been detected in meteorite samples ... To see whether nucleobases could form under extraterrestrial conditions, the researchers also ran ...

Biosamples, from which DNA and RNA are extracted ... DNA remains a double helix but shifts to the A form of the helix. The A-form DNA, from top down, looks like a corkscrew, with the base pairs ...

RNA polymerase moves along the DNA strand. Free RNA nucleotides form hydrogen bonds with the exposed DNA strand nucleotides by complementary base pairing to form a strand of mRNA: Note - RNA ...